EARTHQUAKES: Tremors strike Yellowstone, Los Angeles Published: Monday, March 31, 2014 A magnitude-4.8 earthquake struck Yellowstone National Park yesterday, marking the biggest temblor in the park since 1980. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.